Display apparatus

ABSTRACT

A display apparatus is provided. The display apparatus includes a display panel and a plurality of flexible printed circuit boards. The display panel has a fan-out area and a display area. The flexible printed circuit boards are coupled to the display panel. A first side of each flexible printed circuit board is configured with a plurality of first traces for transmitting a first group of clock signals among a plurality of clock signals, and a second side of each flexible printed circuit board opposite to the first side is configured with a plurality of second traces for transmitting a second group of clock signals among the clock signals. The first group of clock signals of one of the flexible printed circuit boards and the second group of clock signals of the adjacent flexible printed circuit board are transmitted to the display area through the fan-out area together.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan applicationserial no. 111141215, filed on Oct. 28, 2022. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND Technical Field

The disclosure relates to a display apparatus, and particularly relatesto a display apparatus which has a plurality of display areas.

Description of Related Art

In a display apparatus, in addition to a display panel configured withpixels, there is also a timing controller configured on a rigid printedcircuit board. The display panel and the rigid printed circuit board areelectrically connected to each other through a plurality of flexibleprinted circuit boards, and a driving circuit may be configured on theflexible printed circuit board to improve an overall utilization rate.Further, a control signal (e.g., clock signal) provided by the circuiton the rigid printed circuit board is not only provided to the circuiton the flexible printed circuit board, but also transmitted to thedisplay panel through the flexible printed circuit board. However, dueto the existence of the circuit on the flexible printed circuit board,the flexible printed circuit board transmits the control signal from therigid printed circuit board through two sides, which affects the lineimpedance of the control signal, and also affects the display effect ofthe display panel.

SUMMARY

The disclosure provides a display apparatus which can match a lineimpedance between clock signals, so as to suppress a chromaticaberration formed on a display panel due to a mismatch of the lineimpedance of the clock signals.

The display apparatus according to an embodiment of the disclosureincludes a display panel and a plurality of flexible printed circuitboards. The display panel has a fan-out area and a display area. Theflexible printed circuit boards are coupled to the display panel, afirst side of each flexible printed circuit board is configured with aplurality of first traces for transmitting a first group of clocksignals among a plurality of clock signals, and a second side of eachflexible printed circuit board opposite to the first side is configuredwith a plurality of second traces for transmitting a second group ofclock signals among the clock signals. The first group of clock signalsof one of the flexible printed circuit boards and the second group ofclock signals of an adjacent flexible printed circuit board aretransmitted to the display area through the fan-out area together.

Based on the above, in the display apparatus of the embodiment of thedisclosure, the first group of clock signals of one of the flexibleprinted circuit boards and the second group of clock signals of theadjacent flexible printed circuit board are transmitted to the displayarea through the fan-out area together, which can be matched to the lineimpedance between the clock signals, so as to suppress the chromaticaberration caused by the mismatch of the line impedance of the clocksignals on the display panel.

In order to make the above-mentioned features and advantages of thedisclosure more comprehensible, the following embodiments are given anddescribed in detail with the accompanying drawings as follows.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGURE is a schematic system diagram of a display apparatus according toan embodiment of the disclosure.

DESCRIPTION OF THE EMBODIMENTS

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood bypersons skilled in the art to which this disclosure belongs. It is to beunderstood that such terms, such as those defined in commonly useddictionaries, should be interpreted as having meanings consistent withthe relevant art and the background or context of the disclosure, andshould not be interpreted in an idealized or overly formal manner,unless specifically defined in the disclosure.

It is to be understood that, although the terms “first,” “second,”“third,” etc. may be used herein to describe various elements,components, regions, layers, and/or sections, these elements,components, regions, and/or sections shall not be limited by theseterms. These terms are only used to distinguish one element, component,region, layer, or section from another element, component, region,layer, or section. Therefore, “first element,” “first component,” “firstregion,” “first layer,” or “first section” mentioned below may bereferred to as “second element,” “second component,” “second region,”“second layer,” or “second section” without departing from the teachingsin the disclosure.

The terms used herein is merely for describing particular embodimentsand is not limiting. As used in the disclosure, unless specificallydefined, the singular forms “a,” “an,” and “the” are intended to includethe plural forms including “at least one”; and the term “or” means“and/or”. As used in the disclosure, the term “and/or” includes any andall combinations of one or more of the associated listed items. It isalso to be understood that, when used in the disclosure, the terms“comprising” and/or “including” designate the presence of statedfeatures, regions, integers, steps, operations, elements, and/orcomponents, but do not exclude one or more of the presence, or addition,of other features, regions, integers, steps, operations, elements,components, and/or combinations thereof.

FIGURE is a system schematic diagram of a display apparatus according tothe first embodiment of the disclosure. Referring to the FIGURE, in theembodiment, the display apparatus 100 includes a rigid printed circuitboard 110, a plurality of flexible printed circuit boards 120_1˜120_9,and a display panel 130. The rigid printed circuit board 110 is coupled(or electrically connected) to the display panel 130 via the flexibleprinted circuit boards 120_1˜120_9. Numbers in the reference numeralsare used to distinguish different elements, not to limit the number ofthe elements.

The display panel 130 has a fan-out area 131 and a display area 132. Thefirst side 120_1 a (e.g., a left side shown in FIGURE) of each flexibleprinted circuit board (the flexible printed circuit board 120_1 is takenas an example) is configured with a plurality of first traces TC1 (shownhere as a single line, but in fact, each clock signal CK1˜CK8 istransmitted by a different first trace TC1) for transmitting a firstgroup of clock signals CK1˜CK8 among a plurality of clock signalsCK1˜CK16, and a second side 120_1 b (e.g., a right side shown in FIGURE)of each flexible printed circuit board (the flexible printed circuitboard 120_1 is also taken as an example) opposite to the first side120_1 a is configured with a plurality of second traces TC2 (shown hereas a single line, but in fact, each clock signal CK9˜CK16 is transmittedby a different second trace TC2) for transmitting a second group ofclock signals CK9˜CK16 among the plurality of clock signals CK1˜CK16.The number of clock signals is given as an example for illustration, butthe embodiment of the disclosure is not limited thereto.

The first group of clock signals CK1˜CK8 of one of the flexible printedcircuit boards (e.g., the flexible printed circuit boards 120_1˜120_9)and the second group of clock signals CK9˜CK16 of an adjacent flexibleprinted circuit board (e.g., the flexible printed circuit boards120_1˜120_9) are transmitted to the display area 132 through the fan-outarea 131 together. For example, the first group of clock signals CK1˜CK8of the flexible printed circuit board 120_2 and the second group ofclock signals CK9˜CK16 of the adjacent flexible printed circuit board120_1 are transmitted to the display area 132 through the fan-out area131 together; the first group of clock signals CK1˜CK8 of the flexibleprinted circuit board 120_3 and the second group of clock signalsCK9˜CK16 of the adjacent flexible printed circuit board (not shown) aretransmitted to the display area 132 through the fan-out area 131together; and the rest are shown in FIGURE and will not be repeatedhere.

Based on the above, the first group of clock signals CK1˜CK8 has a longinterval with the second group of clock signals CK9˜CK16 on the sameflexible printed circuit board (e.g., the flexible printed circuit board120_1˜120_9), but the first group of clock signals CK1˜CK8 of eachflexible printed circuit board (e.g., the flexible printed circuitboards 120_1˜120_9) has a short interval with the second group of clocksignals CK9˜CK16 of the adjacent flexible printed circuit board (e.g.,the flexible printed circuit boards 120_1˜120_9). Therefore, the firstgroup of clock signals CK1˜CK8 of one of the flexible printed circuitboards (e.g., the flexible printed circuit boards 120_1˜120_9) and thesecond group of clock signals CK9˜CK16 of the adjacent flexible printedcircuit board (e.g., the flexible printed circuit board 120_1˜120_9) aretransmitted to the display area 132 through the fan-out area 131together to match a line impedance between the clock signals CK1˜CK16,so as to suppress a chromatic aberration formed on the display panel 130due to a mismatch of the line impedance of the clock signals CK1˜CK16.

In the embodiment, the display area 132 is divided into a plurality ofsub-display areas 132_1˜132_3, and each sub-display area 132 at leastreceives the first group of clock signals CK1˜CK8 of one of the flexibleprinted circuit boards 120_1˜120_9 and the second group of clock signalsCK9˜CK16 of the adjacent flexible printed circuit board 120_1˜120_9. Forexample, the sub-display area 132_1 can receive the first group of clocksignals CK1˜CK8 of the flexible printed circuit board 120_2 and thesecond group of clock signals CK9˜CK16 of the flexible printed circuitboard 120_1 and/or the first group of clock signals CK1˜CK8 of theflexible printed circuit board 120_3 and the second group of clocksignals CK9˜CK16 of the flexible printed circuit board (not shown), andthe rest are shown in FIGURE and will not be repeated here.

In the embodiment, each of the sub-display areas 132_1˜132_3 isconfigured with at least one scan driver GDR (two scan drivers GDR aretaken as an example here), and each scan driver GDR is configured toreceive the first group of clock signals CK1˜CK8 of one of the flexibleprinted circuit boards 120_1˜120_9 and the second group of clock signalsCK9˜CK16 of the adjacent flexible printed circuit board 120_1˜120_9. Forexample, the scan driver GDR on a left side 132_1 a of the sub-displayarea 132_1 shown in FIGURE can receive the first group of clock signalsCK1˜CK8 from the flexible printed circuit board 120_2 and the secondgroup of clock signals CK9˜CK16 from the flexible printed circuit board120_1, and the scan driver GDR on a right side 132_1 b of thesub-display area 132_1 shown in FIGURE can receive the first group ofclock signals CK1˜CK8 from the flexible printed circuit board 120_3 andthe second group of clock signals CK9˜CK16 from the flexible printedcircuit board (not shown), and the rest are shown in FIGURE and will notbe repeated here.

In the embodiment, each flexible printed circuit board 120_1˜120_9 isfurther configured with a data driver SiC and provides a plurality ofdisplay voltages Vdt to a corresponding sub-display areas (e.g., thesub-display areas 132_1˜132_3) in the display area 132 based on theclock signals CK1˜CK16.

In the embodiment, the rigid printed circuit board 110 is configuredwith a timing controller 111 and a clock generation circuit 112. Theclock generation circuit 112 is configured to generate the clock signalsCK1˜CK16, and the timing controller 111 is configured to generatecontrol signals (not shown) required for the operation of the scandriver GDR, control signals (not shown) required for the operation ofthe data driver SiC, and data displayed (not shown). The control signals(not shown) required for the operation of the scan driver GDR can betransmitted from the rigid printed circuit board 110 to each of thesub-display areas 132_1˜132_3 through the flexible printed circuitboards 120_1˜120_9.

In the embodiment, since the scan driver GDR is configured close to aside of the sub-display area (e.g., the sub-display areas 132_1˜132_3),considering a lowest line impedance, one of the flexible printed circuitboards (e.g., the flexible printed circuit boards 120_1˜120_9) whichprovides the first group of clock signals CK1˜CK8 and the adjacentflexible printed circuit board (e.g., the flexible printed circuit board120_1˜120_9) which provides the second group of clock signals CK9˜CK16is immediately adjacent to the side of a corresponding sub-display area(e.g., the sub-display areas 132_1˜132_3). For example, the flexibleprinted circuit board 120_1 which provides the second group of clocksignals CK9˜CK16 to the scan driver GDR on a left side 132_1 a of thesub-display area 132_1 shown in FIGURE may be immediately adjacent tothe left side 132_1 a of the sub-display area 132_1, and the flexibleprinted circuit board 120_3 which provides the first group of clocksignals CK1˜CK8 to the scan driver GDR on a right side 132_1 b of thesub-display area 132_1 shown in FIGURE may be immediately adjacent tothe right side 132_1 b of the sub-display area 132_1, and the rest areshown in FIGURE and will not be repeated here.

Relatively speaking, upon considering the overall line impedance, thefirst group of clock signals CK1˜CK8 transmitted by one of the flexibleprinted circuit boards (e.g., the flexible printed circuit boards120_1˜120_9) and the second group of clock signals CK9˜CK16 transmittedby the adjacent flexible printed circuit board (e.g., the flexibleprinted circuit board 120_1˜120_9) may be adopted, but the embodiment ofthe disclosure is not limited thereto.

In the embodiment, regarding the flexible printed circuit board (e.g.,the flexible printed circuit board 120_1˜120_9) which provides thesecond group of clock signals CK9˜CK16 to the sub-display area (e.g.,the sub-display area 132_1˜132_3), the first group of clock signalsCK1˜CK8 of a first side is not transmitted to the display panel 130. Inaddition, regarding the flexible printed circuit board (e.g., theflexible printed circuit board 120_1˜120_9) which provides the firstgroup of clock signals CK1˜CK8 to the sub-display area (e.g., thesub-display area 132_1˜132_3), the second group of clock signalsCK9˜CK16 of a second side is not transmitted to the display panel 130.For example, the first group of clock signals CK1˜CK8 of the first side120_1 a (i.e., a left side in FIGURE) of the flexible printed circuitboard 120_1 is not transmitted to the display panel 130, and the secondgroup of clock signals CK9˜CK16 of the second side 120_1 b (i.e., aright side in FIGURE) of the flexible printed circuit board 120_2 is nottransmitted to the display panel 130, and the rest are shown in FIGUREand will not be repeated here.

In the embodiment, each sub-display area (e.g., the sub-display area132_1˜132_3) may correspond to a plurality of flexible printed circuitboards (e.g., the flexible printed circuit boards 120_1˜120_9), and eachsub-display area (e.g., the sub-display area 132_1˜132_3) may only needa limited group (e.g., 2 groups) of the clock signals CK1˜CK16.Therefore, some of the first group of clock signals CK1˜CK8 and thesecond group of clock signals CK9˜CK16 transmitted by the flexibleprinted circuit boards (such as the flexible printed circuit boards120_1˜120_9) are not transmitted to the display panel 130.

In summary, in the display apparatus of the embodiment of thedisclosure, the first group of clock signals has a long interval withthe second group of clock signals on the same flexible printed circuitboard, but the first group of clock signals of each flexible printedcircuit board has a short interval with the second group of clocksignals of the adjacent flexible printed circuit board. Therefore, thefirst group of clock signals of one of the flexible printed circuitboards and the second group of clock signals of the adjacent flexibleprinted circuit board are transmitted to the display area through thefan-out area together to match the line impedance between the clocksignals, so as to suppress the chromatic aberration formed on thedisplay panel due to the mismatch of the line impedance of the clocksignals.

Although the disclosure has been disclosed with reference to theembodiments above, they are not intended to limit the disclosure. Anyonewith ordinary knowledge in the technical field can make some changes andmodifications without departing from the spirit and scope of thedisclosure. Therefore, the protection scope of the disclosure shall bedetermined by the appended claims.

What is claimed is:
 1. A display apparatus, comprising: a display panelcomprising a fan-out area and a display area; and a plurality offlexible printed circuit boards coupled to the display panel, wherein afirst side of each of the flexible printed circuit boards is configuredwith a plurality of first traces for transmitting a first group of clocksignals among a plurality of clock signals, and a second side of each ofthe flexible printed circuit boards opposite to the first side isconfigured with a plurality of second traces for transmitting a secondgroup of clock signals among the clock signals, wherein the first groupof clock signals of one of the flexible printed circuit boards and thesecond group of clock signals of an adjacent flexible printed circuitboard are transmitted to the display area through the fan-out areatogether.
 2. The display apparatus as claimed in claim 1, wherein eachof the flexible printed circuit boards is further configured with a datadriver which provides a plurality of display voltages to the displayarea based on the clock signals.
 3. The display apparatus as claimed inclaim 1, further comprising: a rigid printed circuit board coupled tothe flexible printed circuit boards and configured with a timingcontroller and a clock generation circuit, wherein the clock generationcircuit is configured to generate the clock signals.
 4. The displayapparatus as claimed in claim 1, wherein the display area is dividedinto a plurality of sub-display areas, and each of the sub-display areasat least receives the first group of clock signals of one of theflexible printed circuit boards and the second group of clock signals ofthe adjacent flexible printed circuit board.
 5. The display apparatus asclaimed in claim 4, wherein each of the sub-display areas is configuredwith at least one scan driver, and each scan driver is configured toreceive the first group of clock signals of one of the flexible printedcircuit boards and the second group of clock signals of the adjacentflexible printed circuit board.
 6. The display apparatus as claimed inclaim 4, wherein one of the flexible printed circuit boards or theadjacent flexible printed circuit boards is immediately adjacent to aside of a corresponding sub-display area.
 7. The display apparatus asclaimed in claim 1, wherein the second group of clock signals on thesecond side of one of the flexible printed circuit boards is nottransmitted to the display panel.
 8. The display apparatus as claimed inclaim 1, wherein the first group of clock signals on the first side ofthe adjacent flexible printed circuit board is not transmitted to thedisplay panel.